Motorola working with Google for Nexus 5?

Is motorola working with google for Nexus 5 which will launch in Q4 of this year? The same guy who gave all the very rumours about the Moto-X , Taylor Wimberly, now says that the next generation of Nexus which is rumoured to be of 5-inches will be produced by Motorola for the first time ever. Nexus 5 is also rumoured to have 4GB ram combined with 800 Snapdragon to give you best experience. The upcoming Nexus 5 will run 5.0 Key Lime Pie as per some sources.